KY WONG

Problem of qj71c24N for modbus RTU CRC-16

3 posts in this topic

Hi friends,  

I am using G(P).CPRTCL to create the RS485 communication code to control my OMRON Temperature controller Modbus. However, I find out that the generate crc-16 code for my comment is different from the calculated MODBUS CRC-16 . How can it be? I am using predefine function of PLC. It should give me a correct crc-16 right?  @Wasan, @kaare_t

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Do you have USB to RS-485 module? If exist you should use Modbus Scanner to read data from Temperature Controller first.

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On 01.08.2019 at 1:19 PM, KY WONG said:

Hi friends,  

I am using G(P).CPRTCL to create the RS485 communication code to control my OMRON Temperature controller Modbus. However, I find out that the generate crc-16 code for my comment is different from the calculated MODBUS CRC-16 . How can it be? I am using predefine function of PLC. It should give me a correct crc-16 right?  @Wasan, @kaare_t

Yes

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